@article{AA_2005_17_1_a7,
     author = {R. M. Kashaev},
     title = {On selfadjont extensions of a~difference operator},
     journal = {Algebra i analiz},
     pages = {209--223},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2005_17_1_a7/}
}